Horology: time measuring systems or devices – Chronological – With electro-optical display
Patent
1977-04-12
1980-07-22
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With electro-optical display
368242, G04B 1930, G04B 1906
Patent
active
042132940
ABSTRACT:
A number of analog type time displays for electronic watches and the like use electro-optical elements, such as liquid crystals, to present hour and minute hand positions. The embodiments use 12 and 24 hour elements to show the hour positions and to cooperate with 24 or 60 minute elements to show the minute positions. One set of embodiments uses 24 minute elements in combination with 12 or 24 hour elements to show 24 minute hand positions and, additionally, to indicate the other 36 minute positions as one minute before or after the 24 minute hand positions by periodically turning on the before or after adjacent minute element. Another set of embodiments uses 60 minute elements shaped to combine with 12 or 24 hour elements to form 60 different minute hands. The hour elements in the latter set are shaped to effectively function as part of 2, 3, and 5 minute hands. One of the embodiments uses a combination of elements for each hour hand to provide a better shaped hand with a greater area. The invention apparatus turns the hour and minute elements forming a minute hand on in repetitive sequence to provide better perceptual association of the elements as a combination and to add visual appeal. The apparatus minimizes the number of pinouts required from the integrated circuit to the displays by using a novel phase and time multiplexing system which allows the same set of common electrodes to serve for both the hour and minute elements and turns on two hour elements by energizing two combinations of electrodes of the same set.
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